[OpenWrt-Devel] 回复：[PATCH] ramips: reset m25p80 when shutdown

[未命名]

Instead of use the set_4byte function in spi-nor.c, I use this patch for simplest modification. In fact, set_4byte also send 0xe9 command to the spi flash.


Signed-off-by: Shonn Lu <countrysideboy at qq.com>
---
 .../0064-reset-m25p80-when-shutdown.patch          | 27 ++++++++++++++++++++++
 1 file changed, 27 insertions(+)
 create mode 100644 target/linux/ramips/patches-3.18/0064-reset-m25p80-when-shutdown.patch

diff --git a/target/linux/ramips/patches-3.18/0064-reset-m25p80-when-shutdown.patch b/target/linux/ramips/patches-3.18/0064-reset-m25p80-when-shutdown.patch
new file mode 100644
index 0000000..aca758d
--- /dev/null
+++ b/target/linux/ramips/patches-3.18/0064-reset-m25p80-when-shutdown.patch
@@ -0,0 +1,27 @@
+--- a/drivers/mtd/devices/m25p80.c
++++ b/drivers/mtd/devices/m25p80.c
+@@ -322,6 +322,16 @@
+ {
+ 	struct m25p	*flash = spi_get_drvdata(spi);
+ 
++	if ((&flash->spi_nor)->addr_width > 3) {
++	printk(KERN_INFO "m25p80: exit 4-byte address mode\n");
++	flash->command[0] = SPINOR_OP_EX4B;  // exit 4-byte address mode: 0xe9
++	spi_write(flash->spi, flash->command, 1);
++	flash->command[0] = 0x66;  // enable reset
++	spi_write(flash->spi, flash->command, 1);  
++	flash->command[0] = 0x99;  // reset
++	spi_write(flash->spi, flash->command, 1);
++	}
++
+ 	/* Clean up MTD stuff. */
+ 	return mtd_device_unregister(&flash->mtd);
+ }
+@@ -385,6 +395,7 @@
+ 	.id_table	= m25p_ids,
+ 	.probe	= m25p_probe,
+ 	.remove	= m25p_remove,
++	.shutdown = m25p_remove, // add shutdown method to reset spi flash
+ 
+ 	/* REVISIT: many of these chips have deep power-down modes, which
+ 	 * should clearly be entered on suspend() to minimize power use.
-- 
1.9.1
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